What AntiVirus are you using?

I just reinstalled windows xp today, and i had been using symantec corporate 10, but was curious what other av programs are out there that you guys use? Any recommendations or should i just stick with SC10

*edit*

also, any type of pc management software? i was using system mechanic 6, and im not sure if it did as good for my pc as it should

I used AVG AS for a long time (it used to be known as E.W.I.D.O.) and have loved it. It really gets rid of everything. and it's all free. That's all I run for virus/spyware software and it runs perfect

this is all good stuff, thanks alot guys, gonna apply it to my pc when i get home today

i had reformatted my pc because occasionally for no reason it would just restart itself, be like watching a tv show or a movie and right to black and its rebooting. I had had alot of crap in the registry i couldnt remove(like microsoft zune stuff from my 360) but I can't tell if its a heat issue yet, My little Intel onboard diagnostics don't show my temps hitting higher than 115 @ the processor, everywhere else in the case is usually 89-93 degrees. Usually processor temp even while watching a video is around 104

We have an employee who had AVG installed on his machine by his former employer, but it wasn't interfacing with Outlook 2003 properly. I don't remember what exactly it was doing, but it wouldn't let him receive emails. Is this at all a common problem with AVG?